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Bypass eglMakeCurrent where possible.

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This has the possibility to be very slow on some GPUs. A nicer alternative would
have been to fix this in QOpenGLContext, but with makeCurrent and updateContext
having been merged in Qt 5, makeCurrent is required every frame call, and thus
cannot be fixed there.

Change-Id: Ib17dbb3a1e4e89c60dfd4f12a55eeff353f9075f
Done-with: Carsten Munk <carsten.munk@jollamobile.com>
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>
This commit is contained in:
Robin Burchell 2013-08-01 13:37:21 +02:00 committed by The Qt Project
parent c615dcc441
commit 812e23cea2
1 changed files with 8 additions and 0 deletions
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8
src/platformsupport/eglconvenience/qeglplatformcontext.cpp
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@ -106,6 +106,14 @@ bool QEGLPlatformContext::makeCurrent(QPlatformSurface *surface)
EGLSurface eglSurface = eglSurfaceForPlatformSurface(surface);
// shortcut: on some GPUs, eglMakeCurrent is not a cheap operation
if (eglGetCurrentContext() == m_eglContext &&
eglGetCurrentDisplay() == m_eglDisplay &&
eglGetCurrentSurface(EGL_READ) == eglSurface &&
eglGetCurrentSurface(EGL_DRAW) == eglSurface) {
return true;
}
bool ok = eglMakeCurrent(m_eglDisplay, eglSurface, eglSurface, m_eglContext);
if (!ok)
qWarning("QEGLPlatformContext::makeCurrent: eglError: %x, this: %p \n", eglGetError(), this);